virtio: wrap find_vqs

We are going to add more parameters to find_vqs, let's wrap the call so
we don't need to tweak all drivers every time.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 87fe111..d0699c5 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1945,9 +1945,9 @@
 		}
 	}
 	/* Find the queues. */
-	err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
-					      io_callbacks,
-					      (const char **)io_names, NULL);
+	err = virtio_find_vqs(portdev->vdev, nr_queues, vqs,
+			      io_callbacks,
+			      (const char **)io_names, NULL);
 	if (err)
 		goto free;